Question

Vou dar melhor resposta a quem me ajudar!!!​

Answer 1

$\texttt {Ol\'a! :D}\\\rule{7cm}{0.01mm}$

01: Adição e subtração com monômios:

a)

$\large \rm ( + 3x) + ( + 7x) = 7x + 3x\\ \large \underline{\boxed{\rm \therefore\:10x}}$

b)

$\large \rm ( - 5y) + ( - 6y) = - 5y - 6y\\ \large \underline{\boxed{\rm \therefore\: - 11y}}$

c)

$\large \rm (5ab) - (4ab) = 5ab - 4ab\\ \large \underline{\boxed{\rm \therefore\:ab}}$

d)

$\large \rm ( -6mn) - ( - mn) = -6mn + mn\\ \large \underline{\boxed{\rm \therefore\: -5mn}}$

02: Divisão e multiplicação com monômios:

a)

$\large \rm ( - 4x) \cdot ( + 15x) = - 4x \cdot 15x\\ \large \underline{\boxed{\rm \therefore\: - 60x^{2} }}$

b)

$\large \rm ( - 5ab) \cdot (-13a{b}^{2} ) = ( - 5a {b}^{2} ) \cdot (13ab ^{2} )\\ \large \underline{\boxed{\rm \therefore\: 65 {a}^{2}b ^{3} }}$

c)

$\large \rm \frac{ - 60 \cancel{ {x}^{3}} }{5 \cancel x} \\ \large \underline{\boxed{\rm \therefore\: - 12 {x}^{2} }}$

d)

$\large \rm \frac{ - 100 \cancel{ {x}} y}{ - 25 \cancel x} \\ \large \underline{\boxed{\rm \therefore\: 4y }}$